Automatic cut-off for engines



2 Sheets-Sheet l.

(No Model.)

J.'B. PITCHPORD.

AUTOMATIC GUT-OPF FOR ENGINES. N. 288,656. Patented Aug. 21, 1883,

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2 Sheets-Sheet 2.

(No Model.)

J. B. PITCHFORD.

AUTOMATIC. GUT-OPF POR ENGINES, No. 288,656. Patented Aug. 2l, 1883.

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key into the keyway, thus connecting the sleeve F and block D, so that both willbelifted together by the next stroke of the eccentric.

The arm U has a sleeve, U', upon the shaft B, anda pinion, f, is fitted into 'a slot in its upper part, soas to engage with a toothed rack, g, cut in the upper part of the iixed feather, uponwhich the sleeve moves uponthe shaft. By means of this rack and pinion the arm U may be moved. upon the shaft B, so as to be lifted by the cam Q sooner or later, and the point of cut off is thus regulated arbitrarily by this device. The sleeve F moves in a guide, N, which is supported by abracket, O.

In the upper part of the guide N is aspring, J, which presses upon the sleeve F and forces it down quickly, when it is released by the movement of the key K. A stem, F, extends upward from the sleeve F, and has fixed to its upper end the usual or any suitable air-cushioning device or dash-pot to relieve the valve from shock in closing, if it be of the puppet variety, or to prevent its going too far in the case of a rotary valve.

The automatic adjustment of the cut-off mechanism is effected by the action of the governor W upon an arm, V, which also prov. jects from shaft R. This arm is lifted, when the engine runs too fast, by disk upon the governor-spindle, and thus rotates the shaft R and moves the krocker-arm l?, and withdraws the key in the same manner as before explained. This latter arm may be s et to theflatest point of cut off desired, and the governor may als be adjusted independent of it.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isi 1. nIn an engine having the horizontal revolving shaft B and the eccentrics C fixed to it, the sleeves F, moving in the guides N, and

- having the blocks D, sliding independently within the sleeves' and moved by the eccentrics, as shown, in combination with the transversely-sliding-keys K, Ypassing through the sleeves, and keyways in the blocks,l whereby the sleeves and blocks may be moved together or detached, so that the sleeves may fall independently of the blocks, substantially as herein described.

2. 'Ihe sleeves F, connected with the steamvalves, so as to open and close them by the rise and fall of the sleeves, in combination with the blocks D, sliding independently within the sleeves, the keys K, sliding through the sleeves, and a mechanism connected with the eccentric shaft, whereby the keys maybe withdrawn after the valves have been opened to allow the valves to close independent of the movement of the eccentrics, substantially as herein described.

3. The reciprocating sleeves F, connected with the steam-valves, the blocks D, moving inside the sleeves and connected with the eccentrics C, and the keys K, sliding trans-,6 5 versely through slots in' the sleeves and in the blocks, in combination with the rocker-arms I), connected with Ythe key, and the arms U and the spiral flanges or cams Q, xed to the eccentric shaft B, whereby the keys are with- 7o drawn and the sleeves allowed to fall, substantially as herein described.

4. The arm projecting from the, sleeve U', the pinion f, and the feather fixed to the shaft B, and having the teeth g, in combination with the spiral iiange or cam Q upon the shaft B, substantially as herein described.

5. The sleeves F, connected with the steamvalves and moving in the guides N, and the springs J, pressing upon the sleeves, in com- 8o bination with the blocks D, connected with the eccentrics C, and sliding within the sleeves, and the keys K, sliding through transverse slots in the sleeves and the blocks, said keys being connected with cams Q upon the eccentric shaft by mechanism substantially as herein described.

6. rlhe sleeves F, connected with the steamvalves and moving in guides N, and the blocks D, eccentrics C, keys K, and cams Q, as shown, in combination with the air-cushions or dashpot M, and the stems F', connecting them with the sleeves F, substantially as herein described. n

7. rIhe sleeves F, connected with the'steamvalves of an engine, the blocks D, sliding independently within the sleeves and actuated by the eccentrics C, in combination with the keys K, connected with the rocker-arms P upon the shaft R, and the arm V, extending from the shaft to the governor-spindle, so as to be raised or lowered by it, substantially as herein described.

8. vThe sleeves F, connected with the steamvalves 'of an engine, the blocks D, sliding independently within the sleeves, and connected with the eccentrics C, in combination with the keys K, connected with the rocker-arms P upon the shaft R, the arms U V, which are lifted by the cam Q on the governor-spindle to withdraw the keys and release the sleeves from the blocks, and the springs L, acting upon the keys to return them into the keyways or slots when they again correspond, substantially as herein described.

In witness whereof Ihereunto set my'hand.

JOHN B. PITCHFOBD.

Vitnesses: i

S. H. NoURsE, J. H. BLooD.

IIO 

